// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_VIEWS_CONTROLS_TABBED_PANE_TABBED_PANE_H_
#define UI_VIEWS_CONTROLS_TABBED_PANE_TABBED_PANE_H_

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/strings/string16.h"
#include "ui/views/view.h"

namespace views {

class Tab;
class TabbedPaneListener;
class TabStrip;

// TabbedPane is a view that shows tabs. When the user clicks on a tab, the
// associated view is displayed.
class VIEWS_EXPORT TabbedPane : public View {
public:
    // Internal class name.
    static const char kViewClassName[];

    TabbedPane();
    ~TabbedPane() override;

    TabbedPaneListener* listener() const { return listener_; }
    void set_listener(TabbedPaneListener* listener) { listener_ = listener; }

    int selected_tab_index() const { return selected_tab_index_; }

    // Returns the number of tabs.
    int GetTabCount();

    // Returns the contents of the selected tab or NULL if there is none.
    View* GetSelectedTab();

    // Adds a new tab at the end of this TabbedPane with the specified |title|.
    // |contents| is the view displayed when the tab is selected and is owned by
    // the TabbedPane.
    void AddTab(const base::string16& title, View* contents);

    // Adds a new tab at |index| with |title|. |contents| is the view displayed
    // when the tab is selected and is owned by the TabbedPane. If the tabbed pane
    // is currently empty, the new tab is selected.
    void AddTabAtIndex(int index, const base::string16& title, View* contents);

    // Selects the tab at |index|, which must be valid.
    void SelectTabAt(int index);

    // Selects |tab| (the tabstrip view, not its content) if it is valid.
    void SelectTab(Tab* tab);

    // Overridden from View:
    gfx::Size GetPreferredSize() const override;
    const char* GetClassName() const override;

private:
    friend class TabStrip;

    // Get the Tab (the tabstrip view, not its content) at the valid |index|.
    Tab* GetTabAt(int index);

    // Overridden from View:
    void Layout() override;
    void ViewHierarchyChanged(
        const ViewHierarchyChangedDetails& details) override;
    bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
    void OnFocus() override;
    void GetAccessibleState(ui::AXViewState* state) override;

    // A listener notified when tab selection changes. Weak, not owned.
    TabbedPaneListener* listener_;

    // The tab strip and contents container. The child indices of these members
    // correspond to match each Tab with its respective content View.
    TabStrip* tab_strip_;
    View* contents_;

    // The selected tab index or -1 if invalid.
    int selected_tab_index_;

    DISALLOW_COPY_AND_ASSIGN(TabbedPane);
};

} // namespace views

#endif // UI_VIEWS_CONTROLS_TABBED_PANE_TABBED_PANE_H_
